flake fix

src/account/migrations/0001_initial.py

src/account/migrations/0002_auto_20190122_1341.py

src/account/migrations/0003_auto_20200202_1541.py

src/account/models.py

src/account/resources.py

src/account/serializers.py

src/account/views.py

src/common/email.py

src/common/permissions.py

src/document/migrations/0001_initial.py

src/document/migrations/0002_auto_20190121_1332.py

src/document/migrations/0003_auto_20190121_1335.py

src/document/migrations/0004_auto_20190123_1812.py

src/document/migrations/0005_auto_20190129_1438.py

src/document/migrations/0006_auto_20200203_0016.py

src/document/models.py

src/groups/migrations/0001_initial.py

src/groups/models.py

src/groups/serializers.py

src/groups/tests.py